20959120215931 has 16 divisors (see below), whose sum is σ = 21307188672000. Its totient is φ = 20613243175200.

The previous prime is 20959120215881. The next prime is 20959120215991. The reversal of 20959120215931 is 13951202195902.

It is a de Polignac number, because none of the positive numbers 2^k-20959120215931 is a prime.

It is a super-2 number, since 2×20959120215931² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20959120215991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26379996 + ... + 27162886.

It is an arithmetic number, because the mean of its divisors is an integer number (1331699292000).

Almost surely, 2^{20959120215931} is an apocalyptic number.

20959120215931 is a deficient number, since it is larger than the sum of its proper divisors (348068456069).

20959120215931 is an equidigital number, since it uses as much as digits as its factorization.

20959120215931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784290.

The product of its (nonzero) digits is 437400, while the sum is 49.

The spelling of 20959120215931 in words is "twenty trillion, nine hundred fifty-nine billion, one hundred twenty million, two hundred fifteen thousand, nine hundred thirty-one".